Introduction
Biological systems are often described in terms of structure: cells, tissues, organs, and networks. Processes are then treated as sequences of events that occur within or between these structures.
This perspective is intuitive, but incomplete. It assumes that structures are primary and that processes merely describe what happens to them over time.
In living systems, however, this relationship is reversed. Structures do not precede process—they are constituted and maintained through it.
Understanding life therefore requires a shift in perspective: from seeing process as change in structure to seeing structure as the temporary stabilisation of ongoing activity.
Process Beyond Change
In conventional usage, process is understood as a sequence of events or activities that produce change. It is typically treated as something that happens within a system.
This view works well for many physical systems, where stable structures undergo transformations that can be described over time.
But living systems are not simply structures that change. They are systems that must continuously generate and maintain the conditions under which they exist.
Process in biology is therefore not secondary to structure. It is the ongoing activity through which structure is sustained.
Process as Organisational Activity
The APS framework reconceives process as the dynamic organisation of constraints and their interactions.
Constraints channel activity into organised form. In living systems, these constraints are not externally imposed—they are maintained through the system’s own activity.
Process is therefore the ongoing organisation through which constraints are sustained and transformed. It is the activity that generates, maintains, and reorganises the conditions required for continued viability.
In this sense, process is not an effect of life. It is the continuous activity through which life is enacted.
Process and Constraint Closure
When constraints become mutually sustaining, they form a network that maintains the system as a coherent whole. This condition is described as constraint closure.
Process is the activity through which this closure is enacted and maintained. Without ongoing process, constraint relations would decay and organisation would collapse.
Process therefore explains how constraint-closed organisation persists through time.
This perspective has direct implications for causation. In APS, constraints are not merely structural features; they are actively maintained conditions that shape what processes can occur. Biological causation therefore includes not only event-based interactions but the viability-oriented maintenance and modulation of constraints within constraint-closed organisation. (See: Biological Causation — From Mechanism to Organised Persistence)
Process, Agency, and Scale
In APS, process is one of three analytically distinguishable but ontologically co-constitutive dimensions of living organisation.
- Agency expresses viability-oriented regulation
- Process enacts organisation through time
- Scale reflects coordination across spatial and temporal domains
None of these dimensions is prior to the others. Each is an analytic projection of a single viability-oriented, constraint-closed organisation.
Process provides the temporal unfolding of this organisation, making visible the continuous activity through which living systems sustain themselves.
Process and Viability
Living systems exist under conditions of continuous change. To persist, they must actively maintain the constraints that enable their organisation.
Process is the means by which this maintenance occurs. Through metabolic activity, physiological regulation, development, and repair, living systems sustain the conditions of their own viability.
Process therefore links organisation to persistence. It is the activity through which viability-oriented organisation is continuously enacted.
Process Across Scales
Biological processes are not confined to a single domain. They extend across molecular, cellular, organismal, and ecological scales.
These processes are not independent. Activity at one scale influences and is influenced by activity at others.
Process therefore operates across interacting scales, coordinating activity in ways that sustain the system as a whole.
Understanding process requires an explanatory framework capable of representing this multiscale organisation.
Why Process Matters
Clarifying the role of process helps resolve several key issues in biology:
- Why structure alone cannot explain persistence
- How living systems maintain themselves over time
- How organisation is continuously regenerated
- How activity across scales is coordinated
By treating process as constitutive rather than derivative, APS provides a framework for understanding life as ongoing organisational activity.
Conclusion
Process is not what happens to life—it is how life exists.
Living systems are not static structures that undergo change, but ongoing organisations of activity that continuously generate and maintain their own conditions of existence.
In APS, process is the dynamic organisation through which living systems sustain and transform the constraints that enable continued viability. It is the temporal enactment of viability-oriented, constraint-closed organisation across interacting scales.
Understanding life therefore requires an explanatory grammar grounded in process—not as change in structure, but as the continuous activity through which organisation persists.